SB 742-1
g. Practice ammunition for the 81mm includes the M68
training cartridge and M1 sabot with separately issued 22mm
CARTRIDGE, 81MM MORTAR
sub caliber that is available in 4 charge levels (DODICs).
Training ammunition for the improved 81mm system utilizes
M1 sabots, full range practice rounds, M879, and a short
a. FSC: 1315.
range practice cartridge (M880). The M880 practice cartridge
b. Ammunition Type: Cartridge, 81mm mortar. Includes can be rebuilt by the unit from separately issued kits
according to TM 9 1315 252 12 & P. Each kit contains
the following models:
replacement fuze, fuze windshield, ignition (propelling) car-
(1) High explosive ammunition: M362 series, M374 tridge, obturating ring, 3 plastic increment plugs, 3 dud plugs,
series, M889 (improved mortar system), and M821 (improved and a breech plug assembly. All M880 cartridges must have
mortar system).
been modified by drilling three holes and adding three dud
plugs.
(2) Red Phosphorous ammunition: M819 (improved
mortar system).
h. Many drawings for the improved 81mm (M800 series)
cartridges are proprietary and therefore cannot be reproduced
(3) Illuminating ammunition:
M301 series and
or disseminated by JMC to other MACOMs.
M853A1 (improved mortar system).
i. Early procurement of improved 81mm HE cartridges
(4) White phosphorous ammunition: M375 series.
from foreign sources was designated M821 or M889 depending
(5) Training and practice ammunition: M43A1 (target on assembled fuzes. These model numbers will be changed to
practice), M68 (training), M879 (practice for improved mortar M984 or M983 respectively for later domestic production.
system), M880 (short-range practice for improved mortar Inspection criteria for M821 or M889 will also apply to M984 or
M983 cartridges.
system), and a rebuild kit for M880 practice round.
c. Obsolete models not specifically addressed in this
appendix include the M43 series (HE), M56 series (HE), M57
Packing clips are not to be removed from the M751 or M775
series (WP), and the M370 (WP).
If these models are
fuzes used with the M879 and M880 practice rounds during
encountered, applicable portions of this supply bulletin will be
inspection. The packing clip is a positive safety mechanism
used to inspect and classify these rounds.
that is to be removed only just prior to firing.
d. M1 sabot and 22mm sub caliber cartridges are not to
be inspected using this appendix.
TM 9-1315-249-12&P
provides procedures and criteria to supplement chapter 2 of
a. Gaging policy is provided in chapter 2 of this supply
this supply bulletin.
bulletin. Gaging is not normally required during PI, RI, or
UBLI.
Gaging, during these inspections (other than IRI),
e. The 81mm cartridges are fin-stabilized rounds fired
should be limited to individual rounds having visual evidence
from smooth bore weapons. A complete round consists of a
of damage or other conditions that may preclude loading and
projectile, fin assembly, ignition cartridge, primer, propelling
firing.
Unless the rounds requiring gaging are truly
charge and, with the exception of the M68 trainer, a fuze.
representative of the lot being inspected, they should be
Improved 81mm ammunition (M800 series), M374A3, and
disregarded in evaluating the lot.
M375A3 have an ignition cartridge assembly which includes a
primer. Some models of HE cartridges are issued either with
b. Table G-1 identifies test and measurement equipment.
or without fuzes. All other rounds are issued fuzed (except the
M68 which has no fuze). For a complete description of these
rounds see TM 43-0001-28 and the drawings for the particular
and alignment
round.
Drawing
NSN
Application
f. The M374 and M375 series cartridges have differences
between the basic and A1 projectile bodies depending on
6518071 5220-00-395-4421
All models
propelling charges for which they were originally designed.
6518101 5220-00-395-4422
Short rounds only
The basic M90 propelling charge has proven compatible and is
authorized for use, with either basic or A1 projectile bodies.
The M90A1 propelling charge is only authorized for use with
the A1 projectile bodies, due to a smaller bourrelet diameter
a. Inspection category.
than the basic. This reduction was necessary to cope with the
greater bore fouling produced by the M90A1 propellant bag
(1) Category V: 6 years (includes jungle pack HE, WP,
during firing. This dimensional difference between the basic
and practice cartridges).
and A1 model projectile body is not cause for gaging or
(2) Category W: 5 years (includes inert items and
measuring during inspection of a previously renovated lot.
jungle pack illuminating cartridges).
The ammunition data card should be checked to assure the
propellant model is compatible with the projectile model. This
(3) Category X: 4 years (includes HE, WP
and
difference must also be considered when planning replacement
practice cartridges not in jungle pack).
of the propellant.
(4) Category Y:
3 years (includes illuminating
cartridges not in jungle pack, ignition cartridges and bulk
propellant).
(5) Category Z: 2 years (includes cartridges in plastic
mono pack, bulk primers, spotting charges and M880 rebuild
kit).
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